Tab and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a tab and a battery, the tab comprises a leading-out section, a transition section and a welding section, the welding section and the leading-out section extend along a first direction, the welding section and the leading-out section are arranged at an interval along the first direction, and the welding section and the leading-out section are arranged at an interval along a second direction. The transition section is arranged between the leading-out section and the welding section; the included angle between the first direction and the second direction is not zero. The lead-out sections of the tabs are connected with the pole core, the welding sections of the tabs are connected with the cover plate or the shell of the battery, and the lead-out sections and the welding sections are arranged at intervals in the first direction and the second direction; according to the tab provided by the embodiment of the invention, the welding section can be welded with the cover plate or the shell above the arc area of the roll core, and the tab can meet the customization requirements of customers, so that the lead-out mode of the tab is more flexible.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a tab and a battery. Background Art

[0002] In common soft-pack lithium-ion batteries, the core can be divided into a rectangular flat area and two semi-cylindrical arc areas according to its shape. The straight area is located in the middle of the width direction of the core, and the arc areas are arranged on both sides of the straight area along the width direction of the core. The welding end of the tab and the lead-out end of the tab are in a straight line, the lead-out end of the tab is connected to the straight area, and the welding end is connected to the shell.

[0003] In the width direction of the winding core, the distance between the side of the tab and the outer edge of the arc region is relatively large. It can be seen that it is difficult to shorten the distance between the side of the tab and the outer edge of the arc region with the existing tab. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a tab, a core and a battery in view of the problem that it is difficult to shorten the distance between the side edge and the arc area of ​​the existing tab.

[0005] In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides a pole ear, including a lead-out section, a transition section and a welding section, the lead-out section extends along a first direction, the first end of the lead-out section is suitable for connection with the pole core, the first end of the welding section is suitable for welding with the battery shell or pole, the transition section is connected between the second end of the lead-out section and the second end of the welding section, and the welding section gradually moves away from the lead-out section from its second end to the first end.

[0006] Optionally, the welding section and the lead-out section are spaced apart along a second direction, and both the first direction and the second direction are perpendicular to the thickness direction of the tab; wherein the angle between the first direction and the second direction is not zero.

[0007] Optionally, the transition section is straight-line, extends along the second direction, and is perpendicular to the welding section; or, the transition section is straight-line, and a non-zero angle exists between the length direction of the transition section and the length direction of the welding section.

[0008] Optionally, the transition section is arc-shaped.

[0009] Optionally, the transition section includes a first arc section and a second arc section, the first arc section and the second arc section are both quarter arcs, one end of the first arc section is connected to the lead-out section, the other end is connected to the second arc section, and the end of the second arc section away from the first arc section is connected to the welding section;

[0010] The center of the first arc segment and the second arc segment are located on both sides of a line connecting the lead-out segment and the welding segment.

[0011] Optionally, the welding section, the lead-out section and the transition section are integrally formed.

[0012] Optionally, the welding section and the lead-out section are parallel.

[0013] On the other hand, the present invention further provides a battery, comprising a winding core and the above-mentioned tabs, wherein two tabs are provided, one of which constitutes a positive electrode tab and the other constitutes a negative electrode tab; the winding core is divided into a straight area, a first arc area, and a second arc area from the middle to both sides along its width direction, the first arc area and the second arc area are located on opposite sides of the straight area, the tabs are provided at the ends of the straight area along the height direction of the winding core, and the tabs are provided on both sides of the width direction of the straight area;

[0014] Along the width direction of the winding core, the welding section of the same pole lug is arranged on a side of the lead-out section away from the other pole lug;

[0015] The first direction is the height direction of the winding core, and the second direction is the width direction of the winding core.

[0016] In another aspect, the present invention further provides a battery comprising a negative electrode tab, a winding core, and the above-mentioned tab;

[0017] The winding core is divided into a straight area, a first arc area, and a second arc area from the middle to both sides along the width direction thereof, wherein the first arc area and the second arc area are located on opposite sides of the straight area, and the negative electrode tab and the tab are both arranged at ends of the straight area along the height direction of the winding core, and the negative electrode tab and the tab are arranged on both sides of the width direction of the straight area;

[0018] Along the width direction of the winding core, the welding section of the electrode tab is arranged on a side of the lead-out section away from the negative electrode tab;

[0019] The first direction is a height direction of the winding core, and the second direction is a width direction of the winding core.

[0020] In another aspect, the present invention further provides a battery comprising a positive electrode tab, a winding core, and the tab, wherein the tab constitutes a negative electrode tab;

[0021] The winding core is divided into a straight area, a first arc area, and a second arc area from the middle to both sides along the width direction thereof, wherein the first arc area and the second arc area are located on opposite sides of the straight area, and the positive electrode tab and the tab are both arranged at the ends of the straight area along the height direction of the winding core, and the positive electrode tab and the tab are arranged on both sides of the width direction of the straight area;

[0022] Along the width direction of the winding core, the welding section of the tab is arranged on a side of the lead-out section away from the positive electrode tab;

[0023] The first direction is a height direction of the winding core, and the second direction is a width direction of the winding core.

[0024] According to the tab and battery of the embodiment of the utility model, the lead-out section of the tab is connected to the pole core, and the welding section of the tab is connected to the cover plate or shell of the battery. The lead-out section and the welding section are spaced apart in the first direction and the second direction. By staggering the welding section and the connecting section, the welding section can be welded to the cover plate or shell above the arc area of ​​the winding core, meeting the customized needs of customers and making the lead-out method of the tab more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the overall structure of a tab provided in one embodiment of the present utility model;

[0026] Figure 2 A schematic front view of the internal structure of a battery provided by one embodiment of the present utility model;

[0027] Figure 3 A schematic top view of the internal structure of a battery provided in one embodiment of the present invention;

[0028] Figure 4 A front view schematic diagram of the internal structure of a battery provided by one embodiment of the present utility model;

[0029] Figure 5 A front structural diagram of the internal structure of a battery provided by an embodiment of the present utility model;

[0030] Figure 6 Schematic diagram of the tab structure provided by one embodiment of the utility model

[0031] Figure 7 This is a diagram of the tab structure provided in one embodiment of the present utility model.

[0032] The accompanying drawings in the specification are as follows: 1, winding core; 11, straight area; 12, arc area; 2, pole ear; 21, lead-out section; 22, transition section; 221, first arc section; 222, second arc section; 23, welding section. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] like Figures 1 to 4 As shown, an embodiment of the present invention provides a tab, comprising a lead-out section 21, a transition section 22, and a welding section 23. The welding section 23 and the lead-out section 21 both extend along a first direction, the welding section 23 and the lead-out section 21 are spaced apart along the first direction, the welding section 23 and the lead-out section 21 are spaced apart along a second direction, and the transition section 22 is disposed between the lead-out section 21 and the welding section 23. The angle between the first direction and the second direction is non-zero. The first direction and the second direction are coplanar. The surface formed by the first direction and the second direction is parallel to the surface formed by the width and length of the tab 2.

[0035] The tab 2 in this embodiment is manufactured by cutting during production. The tab 2 is generally sheet-shaped, and the welding section 23 and the lead section 21 are spaced apart on a side surface parallel to the tab 2, rather than being spaced apart in the thickness direction of the tab 2. In actual use, the lead section 21 of the tab 2 is connected to the battery core, and the welding section 23 of the tab 2 is connected to the cover or housing of the battery. By staggering the welding section 23 and the connecting section, the welding section 23 can be welded to the cover or housing above the arc region 12 of the winding core 1, which is not possible with the prior art. The tab of this embodiment can meet the customized needs of customers and make the tab lead-out method more flexible.

[0036] In this embodiment, the transition section 22 is linear, extends along the second direction, and is perpendicular to the welding section 23. The transition section 22, welding section 23, and lead-out section 21 are perpendicular to each other, which reduces the difficulty of cutting, facilitates processing, and reduces production costs.

[0037] In this embodiment, the welding section 23, the lead section 21, and the transition section 22 are integrally formed. As mentioned above, the tab 2 in this embodiment is produced by shearing, and the welding section 23, the lead section 21, and the transition section 22 are sheared from the same piece of raw material. This is done to simplify the manufacturing process and, because the tab 2 is integrally formed, the electrical conductivity of each part of the tab 2 is equal or very close, thereby ensuring the conductive effect of the tab 2.

[0038] In one embodiment, a battery is provided, comprising a winding core 1 and the above-mentioned tab 2, wherein two tabs 2 are provided, one of which constitutes a positive electrode tab and the other constitutes a negative electrode tab; the winding core 1 is divided into a straight area 11, a first arc area 12, and a second arc area 12 along its width direction from the middle to both sides, wherein the first arc area 12 and the second arc area 12 are located on opposite sides of the straight area 11, and the tabs 2 are provided at the ends of the straight area 11 along the height direction of the winding core 1, and the tabs 2 are provided on both sides of the width direction of the straight area 11;

[0039] Along the width direction of the winding core 1 , the welding section 23 of the same pole tab 2 is arranged on the side of the lead-out section 21 away from the other pole tab 2 ; the first direction is the height direction of the winding core 1 , and the second direction is the width direction of the winding core 1 .

[0040] In this embodiment, the welding section 23 of one tab 2 can be located directly above one arc region 12. The welding section 23 of the other tab 2 can be located directly above another arc region 12, thereby shortening the distance between the outer edge of the arc region 12 and the side edge of the tab 2 for both tabs 2. This increases the design flexibility of the distance between the side edge of the tab 2 and the outer edge of the winding core 1, meeting the diverse customization needs of customers and improving market competitiveness.

[0041] In one embodiment, this embodiment further provides a battery, comprising a negative electrode tab, a winding core 1, and the aforementioned tab; the winding core 1 is divided into a straight region 11, a first arc region 12, and a second arc region 12 along its width direction from the middle to both sides, the first arc region 12 and the second arc region 12 being located on opposite sides of the straight region 11; the negative electrode tab and the tab 2 are both disposed at ends of the straight region 11 along the height direction of the winding core 1, and the negative electrode tab and the tab 2 are disposed on both sides of the width direction of the straight region 11. Along the width direction of the winding core 1, the welding section 23 of the tab 2 is disposed on the side of the lead section 21 away from the negative electrode tab; the first direction is the height direction of the winding core 1, and the second direction is the width direction of the winding core 1.

[0042] Among them, the negative electrode tab and the tab 2 are both arranged on the same side in the height direction of the winding core 1. In this embodiment, the tab 2 constitutes the positive electrode tab, which can meet the customer's need to shorten the distance between the positive electrode tab and the outer edge of the winding core 1 in the width direction.

[0043] In one embodiment, this embodiment further provides a battery, comprising a positive electrode tab, a winding core 1 and the tab 2 described above, wherein the tab 2 constitutes a negative electrode tab;

[0044] The winding core 1 is divided into a straight area 11, a first arc area 12 and a second arc area 12 from the middle to both sides along its width direction. The first arc area 12 and the second arc area 12 are located on opposite sides of the straight area 11. The positive electrode tab and the tab 2 are both arranged at the end of the straight area 11 along the height direction of the winding core 1. The positive electrode tab and the tab 2 are arranged on both sides of the width direction of the straight area 11.

[0045] Along the width direction of the winding core 1 , the welding section 23 of the tab 2 is arranged on the side of the lead section 21 away from the positive electrode tab; the first direction is the height direction of the winding core 1 , and the second direction is the width direction of the winding core 1 .

[0046] In other embodiments, the transition section 22 is linear, and a non-zero angle exists between the length direction of the transition section 22 and the length direction of the welding section 23. In this embodiment, the transition section 22 connects the welding section 23 and the lead-out section 21 at an angle.

[0047] In other embodiments, the transition section 22 may be arc-shaped, which may be a single arc or a plurality of arcs connected in sequence.

[0048] More specifically, the transition section 22 includes a first arc segment 221 and a second arc segment 222, the first arc segment 221 and the second arc segment 222 are both quarter arcs, one end of the first arc segment 221 is connected to the lead-out section 21, and the other end is connected to the second arc segment 222, and the end of the second arc segment 222 away from the first arc segment 221 is connected to the welding section 23; the center of the first arc segment 221 and the second arc segment 222 are located on both sides of the line connecting the lead-out section 21 and the welding section 23.

[0049] The first arc segment 221 and the second arc segment 222 can realize smooth connection between the transition segment 22 and the welding segment 23 and the lead-out segment 21 .

[0050] In this embodiment, the welding section and the lead-out section do not need to be parallel to each other, and there is an angle between the length directions of the two sections.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tab, characterized in that: The invention comprises a lead-out section (21), a transition section (22) and a welding section (23), wherein the lead-out section (21) extends along a first direction, the first end of the lead-out section (21) is suitable for being connected to the pole core, the first end of the welding section (23) is suitable for being welded to the battery shell or pole, the transition section (22) is connected between the second end of the lead-out section (21) and the second end of the welding section (23), and the welding section (23) gradually moves away from the lead-out section (21) from its second end to its first end.

2. The tab according to claim 1, wherein: The welding section (23) and the lead section (21) are spaced apart along a second direction, and the first direction and the second direction are both perpendicular to the thickness direction of the tab (2); wherein the angle between the first direction and the second direction is not zero.

3. The tab according to claim 2, wherein: The transition section (22) is in a straight line shape, the transition section (22) extends along the second direction, and the transition section (22) is perpendicular to the welding section (23); or, the transition section (22) is in a straight line shape, and a non-zero angle exists between the length direction of the transition section (22) and the length direction of the welding section (23).

4. The tab according to claim 2, wherein: The transition section (22) is in an arc shape.

5. The tab according to claim 4, characterized in that: The transition section (22) comprises a first arc section (221) and a second arc section (222), the first arc section (221) and the second arc section (222) are both quarter-circular arcs, one end of the first arc section (221) is connected to the lead-out section (21), and the other end is connected to the second arc section (222), and the end of the second arc section (222) away from the first arc section (221) is connected to the welding section (23); The center of the first arc segment (221) and the second arc segment (222) are located on both sides of a line connecting the lead-out segment (21) and the welding segment (23).

6. The tab according to claim 2, wherein: The welding section (23), the lead-out section (21) and the transition section (22) are integrally formed.

7. The tab according to claim 2, wherein: The welding section (23) and the lead-out section (21) are parallel.

8. A battery, characterized in that: The invention comprises a winding core (1) and a tab (2) according to any one of claims 2 to 7, wherein two tabs (2) are provided, wherein one tab (2) constitutes a positive tab and the other tab (2) constitutes a negative tab; the winding core (1) is divided into a straight area (11), a first arc area and a second arc area from the middle to both sides along its width direction, wherein the first arc area and the second arc area are located on opposite sides of the straight area (11); the tab (2) is provided at the end of the straight area (11) along the height direction of the winding core (1), and the tab (2) is provided on both sides of the width direction of the straight area (11); Along the width direction of the winding core (1), the welding section (23) of the same pole lug (2) is arranged on a side of the lead-out section (21) away from the other pole lug (2); The first direction is the height direction of the winding core (1), and the second direction is the width direction of the winding core (1).

9. A battery, characterized in that: Comprising a negative electrode tab, a winding core (1) and the tab (2) according to any one of claims 2 to 7; The winding core (1) is divided into a straight area (11), a first arc area and a second arc area from the middle to both sides along the width direction thereof, the first arc area and the second arc area are located on opposite sides of the straight area (11), the negative electrode tab and the tab (2) are both arranged at the ends of the straight area (11) along the height direction of the winding core (1), and the negative electrode tab and the tab (2) are arranged on both sides of the width direction of the straight area (11); Along the width direction of the winding core (1), the welding section (23) of the electrode tab (2) is arranged on a side of the lead-out section (21) away from the negative electrode tab; The first direction is the height direction of the winding core (1), and the second direction is the width direction of the winding core (1).

10. A battery, characterized in that: Comprising a positive electrode tab, a winding core (1) and a tab (2) according to any one of claims 2 to 7, wherein the tab (2) constitutes a negative electrode tab; The winding core (1) is divided into a straight area (11), a first arc area and a second arc area from the middle to both sides along the width direction thereof, the first arc area and the second arc area are located on opposite sides of the straight area (11), the positive electrode tab and the tab (2) are both arranged at the ends of the straight area (11) along the height direction of the winding core (1), and the positive electrode tab and the tab (2) are arranged on both sides of the width direction of the straight area (11); Along the width direction of the winding core (1), the welding section (23) of the electrode tab (2) is arranged on a side of the lead-out section (21) away from the positive electrode tab; The first direction is the height direction of the winding core (1), and the second direction is the width direction of the winding core (1).

Images